"what's that .......?"
en.wikipedia.org/wiki/Crankcase_ventilation_system
There are lots of references to it if you google for 'pcv valve'.
Some 4 years ago, my wife's Focus 1.6 petrol (~80k miles) started using lots of oil - the thirst seemed to build up over 12 months or so. I reported this at the car's annual MoT/service, and the blokes replaced the pcv valve ....... some say it almost warrants being a standard service item.
After that was done, the oil consumption improved dramatically - I would estimate to about 20% of what it had been using.
I understand, however, that not all engines have this type of system.
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